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Potassium is an electrolyte crucial for proper nerve signalling, muscle function, and heart rhythm. Even small changes in potassium levels can significantly affect heart function, making this an important test for people on certain medications or with kidney disease.

Sodium is an essential electrolyte that helps regulate fluid balance, nerve function, and muscle activity in the body. Abnormal sodium levels can indicate dehydration, kidney problems, or hormonal imbalances.